Best PSU for Intel Core i9-14900K and NVIDIA GeForce RTX 5080
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NVIDIA GeForce RTX 5080
Configuration Analysis
System Performance Assessment
This system, featuring a high-end i9-14900K and RTX 5080, is built for ultimate performance. It will excel at demanding tasks like 4K gaming at high refresh rates, content creation (video editing, 3D rendering), and running complex simulations. Expect smooth performance and minimal bottlenecks across a variety of applications.
Recommended Power Supplies
CORSAIR RM850e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black
Thermaltake GF1 (2024) Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P
The Thermaltake GF1 850W Gold is perfect: fully modular for clean builds and has ample, efficient power for your hungry i9 and RTX 5080.
MSI MAG A850GL PCIE 5.1 & ATX 3.1 Gaming Power Supply – Full Modular – 80 Plus Gold Certified 850W – Compact Size – ATX PSU – 10 Year Warranty
The MSI MAG A850GL's ATX 3.1 & PCIe 5.1 support is perfect for your 14900K/RTX 5080, future-proofing your build with its 850W and 10-year warranty.
Comparison Table
| Model | Wattage | Efficiency | Form Factor | Modularity | Price | Best For |
|---|---|---|---|---|---|---|
| CORSAIR RM850e (2025) Fully Modular Low-Noise ATX Power Supply with 12V-2×6 Cable – ATX 3.1 & PCIe 5.1 Compliant, Cybenetics Gold Efficiency, 105°C-Rated Capacitors, Modern Standby Mode – Black | 850W | 80+ Gold | ATX | Full-Modular | $129.99 | Overall Value |
| Thermaltake GF1 (2024) Fully Modular ATX 850W Power Supply – 80 Plus Gold – Ultra Quiet – Zero RPM, PS-TPD-0850FNFAGU-P | 850W | 80+ Gold | ATX | Full-Modular | $99.99 | Energy Efficiency |
| MSI MAG A850GL PCIE 5.1 & ATX 3.1 Gaming Power Supply – Full Modular – 80 Plus Gold Certified 850W – Compact Size – ATX PSU – 10 Year Warranty | 850W | 80+ Gold | ATX | Full-Modular | $119.99 | Energy Efficiency |
Why This Wattage?
Power Calculation
The recommended PSU wattage is calculated based on the total power draw of your CPU (Intel Core i9-14900K) and GPU (NVIDIA GeForce RTX 5080), plus approximately 100W for other components like motherboard, memory, and storage devices.
Extra Headroom
We add an additional 30% headroom to ensure optimal efficiency, handle power spikes, and allow for future upgrades. This ensures your system runs stable and your PSU operates in its optimal efficiency range.
Efficiency Standards
We recommend power supplies with 80 Plus certification, which represents higher energy efficiency and more reliable performance. Power supplies are most efficient at 50-60% load, so having adequate headroom is important.
Power Efficiency Tips
Enable CPU and GPU power saving features in BIOS and driver settings (e.g., Intel Speed Shift, NVIDIA WhisperMode) to dynamically adjust power consumption.
Optimize in-game graphics settings to balance visual quality and power draw. Lowering demanding settings can significantly reduce GPU load.
Monitor PSU wattage draw during peak gaming or content creation to ensure it's within a comfortable range (e.g., below 80% capacity) for optimal efficiency and longevity.
Special Installation Note
Ensure the 12V-2×6 (or PCIe 5.0) cable is directly connected from the PSU to the RTX 5080, rather than using adapters, to provide stable and sufficient power delivery for this high-power GPU.
Usage Scenarios
Ultra Gaming
Play any modern game at maximum settings (4K or higher) with ultra-smooth frame rates, ray tracing enabled, and zero performance bottlenecks.
Content Creation
Effortlessly edit 8K video, render complex 3D scenes, and handle demanding creative tasks with blazing-fast speeds and real-time previews.
AI Development
Train and deploy complex AI models, run simulations, and perform data analysis quickly and efficiently, leveraging the powerful GPU for acceleration.
Installation Tips
Position Properly
Most cases have a dedicated PSU bay at the bottom. Ensure the PSU fan is facing down if your case has bottom ventilation, allowing it to draw cool air from outside.
Cable Management
With modular PSUs, connect only the cables you need. Route cables behind the motherboard tray when possible for better airflow and cleaner appearance.
Proper Connections
Ensure all power connectors are fully seated and locked. The NVIDIA GeForce RTX 5080 will require dedicated PCIe power connectors from the PSU.
Test Before Completing
Before fully closing your case, connect the essential components and test that your system boots correctly with the new power supply.
The RM850e's 850W and ATX 3.1 compliance are perfect for your i9-14900K and RTX 5080, ensuring stable power delivery for demanding tasks.